Directional coupler
US-2025329910-A1 · Oct 23, 2025 · US
the guides being hollow waveguides
the guides being hollow waveguides · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01P5/181 |
| Official title | {the guides being hollow waveguides} |
| Display label | the guides being hollow waveguides |
| Total patents | 52 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 9 |
| 2019 | 12 |
| 2020 | 6 |
| 2021 | 6 |
| 2022 | 5 |
| 2023 | 3 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Microwave-based heating device
US-2025318025-A1 · Oct 9, 2025 · US
GaAs monolithic integrated terahertz low-noise communication system transceiver front-end
US-12212357-B2 · Jan 28, 2025 · US
Rf module
US-2025022815-A1 · Jan 16, 2025 · US
Gaas monolithic integrated terahertz low-noise communication system transceiver front-end
US-2023238997-A1 · Jul 27, 2023 · US
Ridge gap waveguide crossover structure including intersecting transmission lines with impedance transformers disposed between upper and bottom planar metal plates and having a gap therein
US-11670830-B2 · Jun 6, 2023 · US
Broadband panel array antenna
US-11600930-B2 · Mar 7, 2023 · US
Waveguide with internal, self-supported feature(s)
US-2022190460-A1 · Jun 16, 2022 · US
Ridge gap waveguide millimeter-wave crossover bridge structure device and center-structure module
US-2022166119-A1 · May 26, 2022 · US
Waveguide coupling systems and methods
US-11309619-B2 · Apr 19, 2022 · US
Duo-quad wideband waveguide combiner/mode-converter transforming two rectangular waveguides in the TE10 rectangular mode to a single circular waveguide output in the TE01 mode
US-11233306-B1 · Jan 25, 2022 · US
Multi-band circularly polarized waveguide feed network
US-11228116-B1 · Jan 18, 2022 · US
Broadband panel array antenna
US-2021359422-A1 · Nov 18, 2021 · US
Diplexer and multiplexer
US-11121695-B2 · Sep 14, 2021 · US
Simplification of complex waveguide networks
US-11114737-B2 · Sep 7, 2021 · US
Flared dielectric coupling system and methods for use therewith
US-11018401-B2 · May 25, 2021 · US
Transformer for a circuit in MMIC technology
US-10892221-B2 · Jan 12, 2021 · US
Guided wave communication system with resource allocation and methods for use therewith
US-10887891-B2 · Jan 5, 2021 · US
Power couplers and related devices having antenna element power absorbers
US-10811754-B2 · Oct 20, 2020 · US
Methods and apparatus for adjusting a phase of electromagnetic waves
US-10658726-B2 · May 19, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01P5/181?
- CPC H01P5/181 is the Cooperative Patent Classification code for “the guides being hollow waveguides.”
- How many patents are filed under CPC H01P5/181 (the guides being hollow waveguides)?
- Our database includes 52 publications tagged with this CPC code.
- Is patent activity under CPC H01P5/181 growing?
- Publication counts under this code: 3 in 2023 vs 4 in 2025 (latest complete years).